云广直流输电工程低端换流变压器真空有载调压开关油流继电器动作跳闸分析及处理

Analysis and Dispose of Vacuum-OLTC Oil Flow Relay Tripping at LV Converter Transformer in Yunnan-Guangdong ±800 kV DC Transmission Project

分析了云广直流输电工程低端换流变压器有载调压开关保护继电器动作跳闸原因,指出滤油机停运时油流冲击导致油流过速是造成这次动作的直接原因,并建议厂家在滤油机内部增加一个节流阀。常温条件下试验证明,采取这个措施后,可有效防止油流继电器误动事故的发生。

Analyzing the cause of the vacuum-OLTC oil flow relay tripping at LV converter transformer in Yunnan-Guangdong ±800 kV DC transmission project, this paper points out that when the oil filter stopped, the exceeding oil impact speed directly led to the faults, and advises the manufacturer to add a throttleer into the oil filter. This measure is validated by the experiment under normal temperature.